Pre-marital sex is extremely important for both partners. Having had multiple sexual partners before marriage is also extremely important. Studies have shown that the most successful marriages are the ones where both partners have had between 2 and 10 previous sexual partners. That's the sweet spot where the divorce rates are lower.

I think everyone (regardless of gender or sex) who has slept with 50 people without getting married is either a sociopath or a severely unhinged person with crippling commitment issues. The typical explanation I've heard is - Those were not 50 relationships. The person was just having some safe adult fun before they were ready to settle down.

Let's assume that's true. Sex is wild, hormonal, and it pumps you full of happy chemicals. I find it extremely disturbing if someone is that good at compartmentalizing intimacy and their physiological response. It's a major red flag that someone's such a control freak that they can shut down every single physiological impulse that's screaming, "Be in a relationship!!!" with every orgasm. If that's not true, the only remaining explanation is that the person is unhinged with serious commitment issues. If a person tries and fails to connect with 50 people, then the problem is with the person. The Red Flag cherry on top is that they're also completely incapable of being honest with themselves.

Either way - major red flags. There are plenty of fish in the sea. I am not that desperate (least of all because I've been in a stable relationship for 7 years and married)